1. X (x<1) Y= 2x-1 (110) 要求输入 x 值后，输出 y 值。package student.xiaoqiao.day01;import java.util.Scanner；public class Yi {public static void main(String[] args) {System.out.println("请输入一个数");Scanner sc = new Scanner(System.in);int x = sc.nextInt();if (x < 1) { System.out.println("y=" + x);}if (x > 1 & x < 10) {System.out.println("y=" + (2 * x - 1));}if (x > 10) {System.out.println("y=" + (3 * x - 11));}}}2.输入一个年份推断year是否是闰年package student.xiaoqiao.day01;import java.util.Scanner;public class Er {public static void main(String[] args) {System.out.println("请输入年份");Scanner sc=new Scanner(System.in);int year=sc.nextInt();if((year%4==0&year%100!=0)|(year%400==0))System.out.println("是闰年");else System.out.println("不是闰年");}}3.任意输入a,b,c 3个数推断a，b，c大小package student.xiaoqiao.day01;import java.util.Scanner;public class San {public static void main(String[] args) {System.out.println("请输入三个数（加空格或回车）:");Scanner sc = new Scanner(System.in);int x = sc.nextInt();int y = sc.nextInt();int z = sc.nextInt();if (x > y & x > z) {System.out.println(x);} else if (x < y & z < y) {System.out.println(y);} else if (x < z & y < z) {System.out.println(z);}}}4_1 输出图形 * ********package student.xiaoqiao.day01;public class Si_1 {public static void main(String[] args) {int temp = 3;for (int i = 1; i <= temp; i++) {for (int j = 1; j <= temp - i; j++) {System.out.print(" ");}for (int k = 1; k <= 2 * i - 1; k++) {System.out.print("*");}System.out.print('\n');}}}4_2 输出图形***** *** *package student.xiaoqiao.day01;public class Si_1 {public static void main(String[] args) {int temp = 3;for (int i = 1; i <= temp; i++) {for (int j = 1; j <= temp - i; j++) {System.out.print(" ");}for (int k = 1; k <= 2 * i - ...
